Stud-removing tool.



W. LAUNHART.

STUD REMOVING TOOL.

APPLICATION FILED JAN-15.1917!- I 1,286,822, Q Patented Aug. 7,1917.

N 2 SHEETSSHEET I.

W. LAUNHART.

STUD REMOVING TOOL.

APPLICATION FILED JAN-15.1917.

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Patented Aug. 7, 1917.

WILLIAM LAUNI-IART, OF NEWTON, KANSAS.

STUD-REMOVING TOOL.

Specification of Letters Patent.

Application filed January 15, 1917. Serial No. 142,457.

To aZZ whom it may concern: 7

Be it known that I, WILLIAM LAUNHART, a citizen of the United States, residing at Newton, in the county of Harvey, State of Kansas, have invented certain new and useful Improvements in Stud-Removing Tools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to stud removing tools especially adapted to remove stud bolts from cylinder heads and other like positions.

It is a Well known fact that when a stud bolt is applied or removed by an ordinary tool such as a pipe wrench or the like, the teeth on the tool mar and injure the threads so that the bolt cannot be used a second time. As a matter of fact it is very difficult to apply stud bolts because of this injury worked to the thread on the bolt.

One object of the present invention is to provide a removing tool of such character that in place of'gripping on the thread of the bolt the blank portion of the bolt will be gripped and in such manner that the bolt will be tightly held against all slipping and consequent burring of the metal so that the tool can be readily turned by an ordinary monkey-wrench to remove the stud.

A second important object of the invention is to provide an improved means of this character wherein certain pawls are employed which may be forced by simple manual operation out of engagement with the stud to which they have been applied or may be moved in a certain position as to permit the ready application of the tool without injuring the threads of the stud.

With the above and other objects in view, as will be hereinafter apparent the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawing and specifically claimed.

In the accompanying; drawing, like characters of reference indicate like parts in the several views, and:

Figure 1 is a side elevation of the device.

Fig. 2 is an end view thereof.

Fig. 3 is an end view with the cover plate removed.

Fig. 4 is a section on the axis of the devlce.

Fig. 5 is a side view of the wedge piece removed from the device.

Fig. 6 is an end view of said wedge piece. Fig. 7 is a detail section on the line 7-7 of Fig. 1.

Fig. 8 is a detail view of one of the pawls.

In the embodiment of the invention herein illustrated there has been disclosed a tubular body 10, the bore of the tube between its ends being enlarged as at 11 to form a chamber for purposes hereinafter to be set forth. One end of this body 10 is made polygonal on the exterior as indicated at 12 while the opposite end has its face recessed as at 13. These recesses all open inwardly into the bore and at the outer end of each recess is a cylindrical recess 14 for the purpose of receiving one journaled end 15 of a pawl 16 having front teeth 17 formed thereon. In order to hold these pawls in position there is provided a cover plate 18 which is secured to the body 10 by means of suitable screws 19 and in this cover plate are provided openings 20 which aline, when the cover plate is in position, with the recesses 14 so that the other journal 15 of each pawl may be received in the openings 20. By means of this construction these pawls can swing inwardly and outwardly in planes perpendicular to the axis of the device, the pawls projecting into the bore of the device when swung inwardly.

Extending outward from each of the recesses is a suitable slit for the reception of one end of a spring 21, the'free end of the spring bearing against the pawl in the respective recess so as to normally hold the clutch end of said pawl inward in the bore.

Mounted in the chamber 11 is a sliding member 22 which is held from rotation in the chamber by means of a suitable key or spline 23 engaging in a keyway or splineway formed in the side wall of said chamber. On the forward end of this sliding member 22 are wedges 24 which are so arranged that, when the member is slid in the direction of the pawls, these wedges engage bevel surfaces 25 on said pawls and force the pawls into their recesses, swinging the pawls outwardly to accomplish this movement. Thus by moving the member 22 toward the pawls all of the pawls are simulraeemea Aug. 7, rain.

taneously swung out of the bore of the de vice so that it may be slipped over a stud bolt without the toothed ends of the pawls coming into contact with the threads of the bolt. Extending radially outward through the side wall of the body and communicating with the chamber 11 is a passage 26 having its outer end threaded as at 27. In this outer threaded end is received a tubular nut 28 and passing through the tubular nut is a pin having a stem 29 provided intermediate its ends with a collar 30. The inner end of this pin is bent to lie at an angle to the axis of the stem 29 as indicated at 31 and this bent end is received in a suitable opening or recess 32 formed in the member 22. The pin thus constitutes a cam pin and movement of the pin inward forces the member 22 toward the pawls to effect the outward movement of said pawls. In order to normally retain the member 22 in its inward position or away from the pawls there is provided a spring 33 which surrounds the inner end of the stem 29 and bears against the collar 30, the spring bearing against the inner end of the recess 26 also. Thus the spring is constantly urged outward but may be readily forced inward by pressure with the thumb or finger of the operator.

In the operation of the device the pin 29 is pushed inward which causes the member 22 to move toward the pawls and force them into their respective recesses. The device is then placed over the stud bolt and the pin released. Thereupon the member 22 moves backward and the springs 21 force the pawls inward into engagement with the blank portion of the stud. Now by grasping the polygonal end 12 with a wrench and turning the same in the direction of unscrewing these pawls will be forced tightly against the blank portion of the stud and grip the stud so that movement of the wrench will cause unscrewing of said stud.

It will be obvious that the device may be made both right and left'handed so as to screw the stud in or screw it out and that it may be made in various sizes.

There has thus been provided a simple and efficient device of the kind described and for the purpose specified.

It is obvious that many minor changes may be made in the form and construction .of the invention without departing from the material principles thereof. It is not there fore desired to confine the invention to the hollow body, a ring movable longitudinally of said body, and pawls carried by the body and projectable within the body to grip a stud, said ring arranged to contact said pawls for retracting the same.

2. A stud removing tool consisting of a hollow body, a ring movable longitudinally of said body and projectable within the body to grip a stud, and spring means normally holding said pawls in inwardly projected positions, said ring arranged to contact said pawls for retracting the same.

3.'A stud removing tool consisting of a hollow body, a ring movable longitudinally of said body, pawls carried by the body and projectable within the body to grip a stud, spring means constantly urging said pawls inwardly, and means carried by the body to slide said ring to move said pawls outwardly against the influence of'said spring means.

a. A stud removing tool consisting of a hollow body, pawls pivoted tothe body to swing into and out of the hollow portion thereof, a ring for moving said pawls into and out of said hollow body, and means passing through the hollow body and through the ring for sliding said ring.

5. A stud removing tool consisting of a hollow body, pawls pivoted to the body and swinging in planes perpendicular to the axis of the body, spring means urging said pawls inward, a sliding ring for moving said pawls against the action of said spring means, and reciprocating means for sliding said ring.

6. A stud removing tool consisting of a hollow body adapted to fit over a stud, pawls pivoted to, the body to swing in planes perpendicular to the axis of the body into and out of the hollow thereof, springs urging said pawls inward, sliding means carried by the body and movable to-force said pawls outward agamst sald springs, and reciprocating means carried by the hollow body for actuating the sliding means to move the pawls against the action of said springs.

7. A stud removing tool consisting of a hollow body adapted to receive the end of a stud, pawls pivoted to the body and swinging into and out of the hollow thereof in planes perpendicular to the axis of said body, springs urging said pawls inward, a wedge piece slidable longitudinally of the body, and engageable with the pawls to force them outward, and manually operable means to move the wedge iece into engagement with the pawls.

8-. A stud removing tool consisting of a hollow body adapted to receive the end of a stud, pawls pivoted to the body and swinging into and out of the hollow thereof in planes perpendicular to the axis of said body, springs urging said pawls inward, a wedge piece slidable longitudinally of the body, and engageable with the pawls to force them outward, a cam pin projecting into the body and having a cam end engageable with the wedge piece, said'wedge piece having an angularly disposed opening receiving said end, the cam pin being arranged to force the Wedge piece into engagement With the pawls upon movement of the cam pin inward, and a spring urging said cam pin outward.

9. A stud removing tool consisting of a tubular body, the bore at the center of the body being enlarged to form a chamber, one end of said body having recesses in its face opening into the bore of the body, pawls each having an end pivoted in the respective recess, the free ends of said pawls swinging into said bore and being movable to lie in said recesses, an annular cover plate fixed to the recessed end of the body to cover the recesses, springs in said recesses and bearing against the pawls to urge them inward, a member mounted in the chamber and slidable longitudinally thereof, wedges carried by the member and engaging the pawls to force them into their recesses upon move ment of the member in the direction of the pawls, said member having a lateral opening disposed at an oblique angle to the axis of the body, a radially movable pin extending through the Wall of the body with one end projecting outwardly, the remaining end of the pin being angularly disposed and having its extremity engaging in said lateral opening, and a spring urging said pin outward.

In testimony whereof, I aflix my signature, in the presence of two witnesses.

WILLIAM LAUNHART. l/Vitnesses:

J. E. REGIER, W. W. REGLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

